package com.qingcheng.service.impl;

import com.alibaba.dubbo.config.annotation.Reference;
import com.alibaba.dubbo.config.annotation.Service;
import com.qingcheng.pojo.goods.Category;
import com.qingcheng.pojo.goods.Sku;
import com.qingcheng.pojo.order.OrderItem;
import com.qingcheng.service.goods.CategoryService;
import com.qingcheng.service.goods.SkuService;
import com.qingcheng.service.order.CartService;
import com.qingcheng.service.order.PreferentialService;
import com.qingcheng.util.CacheKey;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class CartServiceImpl implements CartService {

    @Autowired
    private RedisTemplate redisTemplate;

    @Reference
    private SkuService skuService;

    @Reference
    private CategoryService categoryService;

    @Override
    public List<Map<String, Object>> findCartList(String username) {
        System.out.println("从redis中提取购物车" + username);
        List<Map<String, Object>> cartList = (List<Map<String, Object>>) redisTemplate.boundHashOps(CacheKey.CART_LIST).get(username);
        if (cartList == null) {
            return new ArrayList<>();
        }
        return cartList;
    }



    @Override
    public void addItem(String username, String skuId, Integer num) {
        //实现思路： 遍历购物车，如果购物车中存在该商品则累加数量，如果不存在则 添加购物车项
        //获取购物车
        List<Map<String, Object>> cartList = findCartList(username);
        boolean flag = false;//是否在购物车中存在
        for (Map map : cartList) {
            OrderItem orderItem = (OrderItem) map.get("item");
            if (orderItem.getSkuId().equals(skuId)) {//购物车存在该商品
                if (orderItem.getNum() <= 0) {//如果数量小于等于0
                    cartList.remove(map);//购物车项删除
                    break;
                }

                int weight = orderItem.getWeight() / orderItem.getNum();//单个商品重量
                orderItem.setNum(orderItem.getNum() + num); //数量累加
                orderItem.setMoney(orderItem.getNum() * orderItem.getPrice());//金额计算
                orderItem.setWeight(weight * orderItem.getNum());//重量计 算
                if (orderItem.getNum() <= 0) {
                    //如果数量小于等于0
                    cartList.remove(map);//购物车项删除
                }
                flag = true;
                break;
            }
        }

        if (flag == false) {
            Sku sku = skuService.findById(skuId);
            if (sku == null) {
                throw new RuntimeException("商品不存在");
            }
            if (!"1".equals(sku.getStatus())) {
                throw new RuntimeException("商品状态不合法");
            }
            if (num <= 0) {
                //数量不能为0或负数
                throw new RuntimeException("商品数量不合法");
            }

            OrderItem orderItem = new OrderItem();

            orderItem.setSkuId(skuId);
            orderItem.setSpuId(sku.getSpuId());
            orderItem.setNum(num);
            orderItem.setImage(sku.getImage());
            orderItem.setPrice(sku.getPrice());
            orderItem.setName(sku.getName());
            orderItem.setMoney(orderItem.getPrice() * num);//金额计算
            if (sku.getWeight() == null) {
                sku.setWeight(0);
            }
            orderItem.setWeight(sku.getWeight() * num); //重量计算

            //商品分类
            orderItem.setCategoryId3(sku.getCategoryId());
            Category category3 = (Category) redisTemplate.boundHashOps(CacheKey.CATEGORY).get(sku.getCategoryId());
            if (category3 == null) {
                category3 = categoryService.findById(sku.getCategoryId()); //根据3级分类id查2级
                redisTemplate.boundHashOps(CacheKey.CATEGORY).put(sku.getCategoryId(), category3);
            }
            orderItem.setCategoryId2(category3.getParentId());
            Category category2 = (Category) redisTemplate.boundHashOps(CacheKey.CATEGORY).get(category3.getParentId());
            if (category2 == null) {
                category2 = categoryService.findById(category3.getParentId()); //根据2级分类id查询1级
                redisTemplate.boundHashOps(CacheKey.CATEGORY).put(category3.getParentId(), category2);
            }
            orderItem.setCategoryId1(category2.getParentId());
            Map map = new HashMap();
            map.put("item", orderItem);
            map.put("checked", true);//默认选中
            cartList.add(map);
        }
        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username, cartList);


    }

    @Override
    public boolean updateChecked(String username, String skuId, boolean checked) {
        //获取购物车
        List<Map<String, Object>> cartList = findCartList(username);
        //判断是否含有已购物品
        boolean isOk = false;
        for (Map map : cartList) {
            OrderItem orderItem = (OrderItem) map.get("item");
            if (orderItem.getSkuId().equals(skuId)) {
                map.put("checked", checked);
                isOk = true;//执行成功
                break;
            }
        }
        if (isOk) {
            redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username, cartList);// 存入缓
        }
        return isOk;
    }

    @Override
    public void deleteCheckedCart(String username) {
        //获取未选中的购物车
        List<Map<String, Object>> cartList = findCartList(username).stream()
                .filter(cart -> (boolean) cart.get("checked") == false)
                .collect(Collectors.toList());
        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username, cartList);// 存入缓存
    }


    @Autowired
    private PreferentialService preferentialService;

    @Override
    public int preferential(String username) {
        //获取选中的购物车 List<OrderItem> List<Map>
        List<OrderItem> orderItemList = findCartList(username).stream()
                .filter(cart -> (boolean) cart.get("checked") == true)
                .map(cart -> (OrderItem) cart.get("item"))
                .collect(Collectors.toList());
//按分类聚合统计每个分类的金额 group by
        Map<Integer, IntSummaryStatistics> cartMap = orderItemList.stream()
                .collect(Collectors.groupingBy(OrderItem::getCategoryId3, Collectors.summarizingInt(OrderItem::getMoney)));
//循环结果，统计每个分类的优惠金额，并累加
        int allPreMoney = 0;//累计优惠金额
        for (Integer categoryId : cartMap.keySet()) {
// 获取品类的消费金额
            int money = (int) cartMap.get(categoryId).getSum();
            int preMoney = preferentialService.findPreMoneyByCategoryId(Long.valueOf(categoryId), money); //获取优 惠金额
            System.out.println("分类：" + categoryId + " 消费金额：" + money + " 优 惠金额：" + preMoney);
            allPreMoney += preMoney;
        }
        return allPreMoney;
    }

    @Override
    public List<Map<String, Object>> findNewOrderItemList(String username) {
        //获取选中的购物车
        List<Map<String, Object>> cartList = findCartList(username);
        //循环购物车列表,重新读取每个商品的最新价格
        for (Map<String, Object> map : cartList) {
            OrderItem orderItem = (OrderItem) map.get("item");
            Sku sku = skuService.findById(orderItem.getSkuId());
            orderItem.setPrice(sku.getPrice());//更新价格
            orderItem.setMoney(sku.getPrice() * orderItem.getNum());//更新金额
        }

        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username, cartList);//存入缓存
        return cartList;
    }
}
